I am almost at my wits end with this. I have the Washi mat (which is supposed to sound better), the Rega original mat, and last week when I was at VPI (new VDH distributor) getting my Van den hul cart replaced, he gave me a VPI mat that has a plastic like backing to a felt mat that he said will never come up from static. It did - several times.
I went back to the Washi and I think the problem with it is that it is slightly larger than the others and may come up because I am lifting it when I lift the record, not form static. If it keeps happening, I am going to put a couple very small pieces of 2 sided scotch tape between the Rega mat and the platter and be done with it. That where the cartridge is set up for anyhow, and the Washi is about 1 mm thinner as is the VPI.
Sometimes practicality and usability become the primary issues. As a side note, the Tru Lift arm lifter I recently got works great (after some tricky adjusting during set up), as long as I remember to reset it every time it lifts the arm before the next record plays. When you're used to doing a ritual for 40 years unconsciously, it takes time to change. Place the record on the mat, brush it, cue it, release the cue......The problem is you don't need the Tru-Lift when you lift off the arm yourself sometimes, so I am always checking it. Oh well, first world problems....